How to Install Varnish Cache for Apache on CentOS 7
What is Varnish Cache?
Varnish is an HTTP accelerator designed for content-heavy dynamic websites as well as APIs. In contrast to other web accelerators, such as Squid, which is a client-side caching proxy, or Apache and nginx, which are primarily origin servers, Varnish was designed as an HTTP accelerator.
Step 1: Add EPEL repository
Run the following command to add EPEL to your CentOS 7 system.
yum install -y epel-release
Step 2: Install Dependency packages
We need to install pygpgme & yum-utils if the repository is added via repo management tool.
yum install -y pygpgme yum-utils
Step 3: Add Varnish Cache repository
In this step, we’re adding Varnish Cache repository for CentOS 7. Copy the commands below and paste them on the terminal.
tee /etc/yum.repos.d/varnish60lts.repo<<EOF [varnish60lts] name=varnishcache_varnish60lts baseurl=https://packagecloud.io/varnishcache/varnish60lts/el/7/x86_64 repo_gpgcheck=1 gpgcheck=0 enabled=1 gpgkey=https://packagecloud.io/varnishcache/varnish60lts/gpgkey sslverify=1 sslcacert=/etc/pki/tls/certs/ca-bundle.crt metadata_expire=300 EOF
Step 4: Install Varnish on CentOS 7
We are going to install Varnish. Using this command.
yum install -y varnish
More information on installed package can be checked using.
rpm -qi varnish
Step 5: Start and enable Varnish on CentOS 7
Next, start and enable Varnish.
systemctl enable varnish system ctl start varnish
Check the status of Varnish.
systemctl status varnish
Step 6: Configure Varnish Cache for Apache Web Server
First, install the Apache.
yum -y install httpd
Then we nees to set Listen port to 8080.
vi /etc/httpd/conf/httpd.conf ... Listen 8080
Restart httpd service after the change.
systemctl restart httpd
Step 7: Configure Varnish Cache Server
Now edit Varnish Cache configuration file and set Listen port to 80.
Edit the line starting with ExecStart, and change from.
ExecStart=/usr/sbin/varnishd -a :**6081** -f /etc/varnish/default.vcl -s malloc,256m
ExecStart=/usr/sbin/varnishd -a :**80** -f /etc/varnish/default.vcl -s malloc,256m
Then restart Varnish systemd service.
systemctl daemon-reload systemctl restart varnish
Ensure that Apache is configured as a backend server for Varnish proxy.
Note port 8080 is configured on Apache web server.
Step 8: Test Varnish Cache on Apache
Finally, we test if Varnish cache is enabled and working with Apache service with the curl command below.
curl -I http://localhost
This gives you the HTTP header information. If you rerun the command, it will show that Varnish cached response.
curl -I http://localhost
We hope everyone understands how to install Varnish on CentOS. Varnish handles all inbound requests before they land to your web server backend: its cache serves all web traffic and, by default, refreshes every two minutes (or a different lifespan, if you decide so). Are you looking for cheap web hosting service providers? Then this is your last destination to end your search. We at TheStack provide premium WordPress hosting, hybrid smart server hosting, SEO dedicated server hosting, and managed virtual private servers at the best price. So, what are you waiting for? Give us a quote to work with us.